JPS5624829A - Vfo circuit - Google Patents

Vfo circuit

Info

Publication number
JPS5624829A
JPS5624829A JP10028079A JP10028079A JPS5624829A JP S5624829 A JPS5624829 A JP S5624829A JP 10028079 A JP10028079 A JP 10028079A JP 10028079 A JP10028079 A JP 10028079A JP S5624829 A JPS5624829 A JP S5624829A
Authority
JP
Japan
Prior art keywords
pulse
data
data pulse
voltage
input
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP10028079A
Other languages
Japanese (ja)
Inventor
Masashi Sakuma
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP10028079A priority Critical patent/JPS5624829A/en
Publication of JPS5624829A publication Critical patent/JPS5624829A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop

Landscapes

  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

PURPOSE:To prevent an advancing-side phase margin from decreasing by placing the leading edge of a data pulse in the center of a window pulse at any time by controlling an oscillator by use of the data pulse of pulse width proportional to a data signal frequency. CONSTITUTION:A data signal is input to one-shot circuit 1 to generate a data pulse. Then, edge detectors 2 and 3 detect the leading edge of the data pulse and the trailing edge of the output pulse of voltage control oscillator 11 and their outputs are input to flip flop 4 to generate a data pulse. Further, phase comparing circuit 14 detects a phase difference between the data pulse and data latch pulse, phase converter 9 converts it into a voltage that corresponds to the phase difference, and the voltage is applied to one-shot circuit 1 and the control input of voltage control oscillator 11 by way of low-pass filter 10.
JP10028079A 1979-08-08 1979-08-08 Vfo circuit Pending JPS5624829A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10028079A JPS5624829A (en) 1979-08-08 1979-08-08 Vfo circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10028079A JPS5624829A (en) 1979-08-08 1979-08-08 Vfo circuit

Publications (1)

Publication Number Publication Date
JPS5624829A true JPS5624829A (en) 1981-03-10

Family

ID=14269778

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10028079A Pending JPS5624829A (en) 1979-08-08 1979-08-08 Vfo circuit

Country Status (1)

Country Link
JP (1) JPS5624829A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61116420A (en) * 1984-11-12 1986-06-03 Hitachi Ltd Phase comparing system
JPS61120381A (en) * 1984-11-13 1986-06-07 デイジタル　イクイプメント　コーポレーシヨン Phase fixing loop for mfm data recording
JPS6387835A (en) * 1986-10-01 1988-04-19 Victor Co Of Japan Ltd Bit clock signal generator for digital signal demodulator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61116420A (en) * 1984-11-12 1986-06-03 Hitachi Ltd Phase comparing system
JPS61120381A (en) * 1984-11-13 1986-06-07 デイジタル　イクイプメント　コーポレーシヨン Phase fixing loop for mfm data recording
JPS6387835A (en) * 1986-10-01 1988-04-19 Victor Co Of Japan Ltd Bit clock signal generator for digital signal demodulator

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